Click titles below to view related graduate textbooks • Grinnell, R.M., Jr., & Unrau, Y.A. (Eds.). (2008). Social work research and evaluation: Foundations of evidence-based practice (8th ed.). New York: Oxford University Press. • Weinbach, R.W., & Grinnell, R.M., Jr. (2010). Statistics for social workers (8th ed.). Boston: Allyn & Bacon. • Grinnell, R.M., Jr., Gabor, P.A., & Unrau, Y.A. (2010). Program evaluation for social workers: Foundations of evidence-based programs (5th ed.). New York: Oxford University Press.